Paper IV of "Properties of compact U (1) gauge theory on the FCC lattice" (12 April 2026). The muon-to-electron mass ratio mu/e = 1/q - 24 = 206. 768 (18 ppm) from the Eisenstein nome. The weak mixing angle sin² (thetaW) = 3/ (z+1) + g²/ (mu/e) = 0. 23121 (38 ppm). All three PMNS angles within 0. 2 sigma via A₄ subgroup. Cabibbo angle 0. 69%. Fermion doublers 95 = 2|Oₕ| - 1.
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